Workshop on R&D for Domestic Hot Water Heat Pumps 2018-10-04T21:00:37+00:00

Workshop meeting at Waseda University in Tokyo 23rd April 2018

Before the 5th Working Meeting for the Annex a workshop was held to discuss the concept reports from the participating countries. In the workshop the speakers were from the participating countries while the main attendents were from Japan and its National Team for the Annex.

The first presentation was given by mr Kenji Matsuda,  General Manager of the Engineering Department within the Japan Refrigeration and Air Conditioning Industry Association (JRAIA).

The other presentations were from Annex participants:

  1. Overview on Activities of Annex 46 in South Korea – Dr. Jeonsik Seo – Korea Refrigeration and Air-conditioning Assessment Center – (KRAAC)
  2. Research and Development Efforts in North America – Dr. Kashif Nawaz – Oakridge Laboratories (USA)
  3. R&D Overview Switzerland – Prof. Dr. Daniel Gstöhl – NTB Interstaatliche Hochschule für Technik Buchs (CH)
  4. French report on R&D on DHW Heat Pumps – Dr. Mihai Radulescu – EDF (F)
  5. R&D for Heat Pumps in Netherlands  – Onno Kleefkens MSc. – Phetradico  (NL)

After the workshop the Annex participants discussed the strategy on how to proceed with the work. There was a general understanding that there are big regional differences in markets and the tradition on hot water use in the domestic sector.

In the European markets there is a trend towards double function heat pumps for both space and hot water heating. In the development towards ‘energy zero’ the DHW demand will be leading in the system design. In large North American markets split systems for space heating/cooling and hot water heating are the standard, both gas fired and electricly heated. This will be long standing for the next decades. The Asian market is very diversified, with a stromg growth in the Chinese market of both solar heated and heat pump heated DHW systems. In Japan the ECO-Cute is leading, although the market penetration is still relatively small. The Korean market is still at the start for DHW Heat Pumps with a promising market in District Heating.

A general feeling of the participants was that:

  • Manufacturers are very well aware of the refrigeration challenges and are ‘working on it’ as a consequence of world wide regulation after the Kigali agreement
  • Regional and cultural differences are demanding for different solutions.
  • End-users are not aware of the advantages on the long term and will traditionally go for the cheapest solution. Without clear governmental legislation the market will not develop in itself towards a wider application of DHW Heat Pumps
  • The traditional installer is not really capable (on a large scale needed for a market transition) to give consumer advice and install the best option. Often oversizing is the case to avoid complaints.
  • Grid operators are interested in the storage capacity of DHW Heat Pumps, although the capacity is smaller than with direct resistance heating and alternative storage technologies are coming on the market an are being researched.

Based upon these findings a Roadmap is being developed.

On the third day of the Working Meeting for the Annex a visit was made to the project of Tokyo Toshi Service Company at Harumi Island Triton Square.

This being a large area project with district heating and a storage system for a number of high rise office buildings. A presentation by Tokyo Toshi Service Company was given.